package day04.handler;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Date;

/**
 * @author chenshijie
 * @date 2023/12/18 14:02
 */

public class FirstClientHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println(new Date() + "客户端写出数据");

        // 1. 获取数据
        ByteBuf buffer = getByteBuf(ctx);

        // 2. 写数据
        ctx.channel().writeAndFlush(buffer);

    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf byteBuf = (ByteBuf) msg;

        System.out.println(new Date() + "：客户端收到数据 -> " + byteBuf.toString(StandardCharsets.UTF_8));
    }

    private ByteBuf getByteBuf(ChannelHandlerContext ctx) {
        // 1. 获取二进制抽象ByteBuf
        ByteBuf buffer = ctx.alloc().buffer();

        // 2. 准备数据，指定字符串的字符集为UTF-8
        byte[] bytes = "你好，netty".getBytes(StandardCharsets.UTF_8);

        // 3. 填充数据到ByteBuf
        buffer.writeBytes(bytes);

        return buffer;
    }
}
